SEIKO Diver SKX399 Automatic Watch
Overview
The Seiko SKX399 (7S26-0020) is a 43mm men's automatic watch with a stainless steel case and a black analog dial protected by hardlex crystal. It uses a 7S26 caliber self-winding mechanical movement that cannot be manually wound or hacked (the second hand does not stop when the crown is pulled out). It ticks 6 times per second which gives the second hand a smoother movement than quartz watches which tick once per second. The watch should run for up to 43 hours when fully wound and will self-wind when moved.
The SKX399 is currently ranked #109 in popularity out of 751 watches in this catalog. No retailer link is on file for .com; current availability is unknown. This watch is part of a family of four watches that are identical except for their color or strap. You can see the other variations in this family as well as other similar models on the left side of the page. By clicking the checkbox under a similar model you can compare that model with this one side-by-side. We use nearly 100 different weighted criteria to calculate which models are the most similar to one another.
SKX399 is only a partial model number. [learn more]
The case of the SKX399 measures approximately 43mm wide (not including the crown) by 13mm thick and is water resistant to 200 meters. This should be sufficient for splashes, rain, baths, showers, swimming and even scuba diving. The crown screws down to help prevent it from being accidentally pulled out while under water. The stainless steel bezel shows minute numbering and can be rotated. The gap between the lugs is 22mm and the rubber band can be removed using a band removal tool to be replaced with another band.
The SKX399 provides the following features and complications:
- Second hand
- Minute hand
- Hour hand
- Day window to show the day of the week including two language choices for the day (English and either Spanish, Arabic, Kanji, Chinese, French, German, Danish or Roman Numerals). When setting the day keep turning the crown to get to the next language. On most models SUN will be red and on some models SAT will be blue.
- Date window to show the day of the month. Note that some watches may be damaged if you attempt to change the date between 8:00 PM and 2:00 AM, in which case you should change the time to be outside that range first then reset the time after adjusting the date. Check your watch manual for details.
- Rotatable bezel
Seiko Date Finder
If you have this watch and want to know when it was made simply enter the six digit serial number from the caseback below then click Find Date. Learn more
Specifications [edit]
Full specifications are listed below. Please report any errors by clicking the edit link above then use the appropriate 
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General
- Retailers No retailer link on file for .com
Search: Amazon | eBay | Chrono24 - Popularity
#109 of 751 - Style Diver
- Gender Men's
Movement
- Type Automatic
- Caliber 7S26
- Jewels 21
- Beats per Hour 21,600 bph(6 bps)
- Power Reserve 43 Hours
- Manual Winding No
- Hacking No
- Instructions Owner's Manual
Case
- Case Width
43mm(without crown) - Case Thickness 13mm
- Case Shape Round
- Case Material Stainless Steel
- Case Code 0020
- Crystal Material Hardlex
- Water Resistance 200 Meters(scuba diving)
- Crown Position 04:00
- Screw Down Crown Yes
- Second Crown No
Complications
- Second Hand Yes
- Minute Hand Yes
- Hour Hand Yes
- Day Window Yes
- Date Window Yes
Band
- Band Width 22mm
- Replaceable Band Yes
- Band Material Rubber
- Band Color Black
Dial
- Dial Color Black
- Dial Reference 1614
- Hour Markings Bars, Triangles
- On the Dial
"Automatic", "Diver's", Water Resistance
Bezel
- Bezel Color Black
- Bezel Function Unidirectional
- Bezel Material Stainless Steel
- On the Bezel Minute Numbering
Inner Bezel / Chapter Ring / Outer Dial
- Inner Bezel Color Black
- On Inner Bezel Bars
Hand Colors
- Hour Hand Silver
- Minute Hand Silver
- Second Hand Black, White
If you see anything that seems incorrect please let us know.
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